Dual 11″ Maradyne fan setup with top and bottom mount flanges. This is a high performance fan setup that will eliminate any overheating and condensing problems. The fan is designed from the highest quality glass filled nylon to stand up to all conditions. The fan is designed with rubber flaps in the top and bottom of the shroud, these flaps allow air to flow through the shroud. The air flowing through the shroud contributes to a cooler radiator, by getting rid of any excess heat that would normally sit in those areas. The fan setup is designed to fit any cross flow radiator with a minimum size of 23-1/2″ x 15-3/4″. The fan measures: 23-5/8″ x 18-7/16″ overall with a 1-1/4″ flange at the top and bottom of the fan assembly. The assembly is 3-13/16″ thick at is thickest point, which is the center of the motors. The flanges are ideal for mounting, or they can be trimmed to fit a custom setup. The fan has six holes molded into the plastic for another easy mounting solution into any flat surface.